Gripper for printing-presses and means for operating same.



No. 818,338. PATENTED AER. 1'7, 1906.

I J BARNETT. GRIPPER FOR PRINTING PRESSES AND MEANS FOR OPERATING SAME.

APPLICATION FILED MAY 26, 1904.

2 SHEETSSHEET l.

3 WWW PATENTED APR. 1' 7, 1906' No. 818,338. M. J. BARNETT.

GRIPPE'R FOR PRINTING PRESSES AND MEANS FOR OPERATING SAME".

APPLIGATION FILED MAY 26, 1904.

2 SHEETS-SHEET 2,

N v Q Q\ w N T w A A MORRISSON J. BARNETT, OF SAN FRANCISCO, CALIFORNIA,ASSIGNOR, BY

MESNE ASSIGNMENTS, TO WHITSON AUTOPRESS COMPANY, A CORPO- RATION OF NEWYORK.

GRIPPER FOR PRINTING-PRESSES AND MEANS FOR OPERATlNG SAME.

Specification of Letters Patent.

Patented April 17, 1906.

Application filed May 26, 1904. Serial No- 209,970.

To all whom it may concern:

Be it known that I, MoRRIssoN .1. BAR- NETT, a citizen of the UnitedStates, residing at San Francisco, in the county of San Francisco andState of California, have invented certain new and useful Improvementsin Grippers for Printing-Presses and Means for Operating the Same, ofwhich the following is a specification.

My invention relates to improvements in gripping devices forprinting-presses and means for operating the same.

The objects of my invention are to provide an apparatus of thischaracter which shall be simple in construction, comprisingcomparatively few parts, accurate in operation, and readily adjusted.

A further object is to provide a gripper which will prevent the edge ofthe paper turning or folding, this being a common defect in prior formsof gripping devices, especially when printing on thin paper.

My invention therefore resides in the novel construction, combination,and arrangement of parts for the above ends, hereinafter fullyspecified, and particularly pointed out in the claims.

In the accompanying drawings, Figure 1 is a side elevation of the upperportion of a printing-press equipped with my improved mechanism. Fig. 2is a broken plan view 0 the same. Fig. 3 is an enlarged side view of thestationary device for raising the gripper to take the paper. Fig. 4 is aperspective view of the swinging cam thereof. Fig. 5 is a horizontalsection on the line A A of Fig. 3. Fig. 6 is a rear view of thismechanism. Fig. 7 is an enlarged side elevation of the stationary camfor raising the gripper to release the paper to permit it to be taken bythe delivery mechanism. Fig. 8 is a horizontal section of the same. Fig.9 is a cross-section on the line B B of Fig. 8. Fig. 10 is an elevationof the cylinder. Fig. 11 is a plan view of the same. Fig. 12 is across-section of the same. Fig. 13 is a similar view showing the gripperraised. Fig. 14 is a perspective view of the gripper proper detached.Fig. 15 is a er spective view of one of the springs detac ed. Fig. 16 isa longitudinal section of the bearings for the cam-shaft, the shaftitself being SllOWll in full.

Referring to the drawings, 1 represents the sliding in holes frame of aprinting-press, having mounted thereon the slideways' 2, in which slidethe boxes 3 for the trunnions 4 of the impressioncylinder 5. 6represents the bed, having racks 7, which engage gear-wheels 8, securedto the heads 9 of the cylinder. On the outside of the gear-wheels 8 arerigidly secured thereto smaller gear-wheels 10, which engage stationaryracks 11. A longitudinal movement imparted to the bed will thus impartto the cylinder a longitudinal movement in the opposite direction. Thispart of the construction, however, forms no part of the inventionclaimed in my present application.

Through the trunnions 4 of the impressioncylinder pass the reduced endsof a cam-shaft 12, and said reduced ends can slide longitudinally inbearings in said trunnions. A spring 13 in one of said bearings adjustedby a screw 14 normally presses said shaft outward in the other bearing,so that the other reduced end, which is rounded, projects out of itsbearing. In this position as the boxes for the cylinder move in theirslideways in the directi-on from right to left in Fig. 1 said projectingend strikes the beveled surface of a cam 15, depending from an arm 16,pivoted on a stud 17, extending outward from the upper bar of theslideway, said arm swinging Within a supporting-frame 18, secured at thetop to f said stud 17 and at the bottom to the frame 1.

Upon said supporting-frame 18 is an offset 19, in which is anadjusting-screw 20, adapted to bear against the rear face of the swinging arm, and thus adjust the point at which the cam begins to act. Nowas the'rounded reduced end of the cam-shaft 12 engages said cam15 it isforced inward, moving the shaft 12 longitudinally. Said shaft hasannular cam-like depressions 21 near its ends, in which normally restthe inner ends of posts 22, formed integrally upon a gripper 23, saidposts in the wall of the cylinder. The cylinder is formed along itswhole length with a sector-like depression at the part through which theposts pass, which depression has a flat side or wall 24 transverse tosaid posts and through which the posts pass,

IOC

and also a thickened flat side or wall 25, ex-

tending substantially parallel with said posts. The gripper 23 hasfingers 26, formed integrally therewith, which are bent atright anglesover the curved surface of the cylinder. Two

bow-springs 27 are secured through their centers by screws 28 to thewall 24, and their flat portions of the ends press the gripper saidplate at a right no chance for its edge to turn under.

agalnst the wall 24 of the end cylinderthat is to say, the sp gs providea double pressure, one of the gripper-fingers on the curved surface ofthe cylinder and the other of the gripper itself against the flat wall24 thereof. The object of the latter construction is to prevent anypaper entering between the gripper and the blanket 30, which is attachedat this point to the cylinder, since the gripper is by these springsalways pressed close up against said b anket. The tension of the sprmgsis adjusted by screws 31, screwed through the springs into the wall 24on each side of the I plain centrl'iil screw 28. fTllile notches1 32,ormed in t e upper edge 0 t egripper-p ate, are to permit the fingers ofthe delivery mechanism (not here shown and which form part of a separateinvention) to enter and remove the sheet of paper from the cylinder whenreleased by the gripper.

Since the ipper-fingers extend over the edge of the p ate atsubstantially a right angle, the sheet of paper (shown at 33) when it 1sfed against the gripping-plate abuts against angle or less, and there isAt the pro er moment the rounded end of the camsha t '12 is releasedfrom the cam and returns under the action ofa spring, and thereuponimmediately the posts 22 fall under the action of the springs 27 intothe annular camlike depressions in the cam-shaft, and the ers come downupon the surface of the cylmder and firmly grip the paper. By thisconstruction, then, the paper is fed to the gripper-fingers in such amanner that its edge.

lmpmges a ainst a surface at right angles or less to its to release thepaper comprises a frame 35, se-

cured by screws 36 through cylindrical portions 37 to the frame of themachine and to the up er bar of the slideway. Said frame has a ovetailedseat 38 for a cam-piece 39, the position of which is accuratel adjustedby means of a screw 40, having a at circular posts resting in saiddepressions, said erases head {11, which worksin a groove 42, cut in thehead of said cam-piece 39. By screwing said head 41 in or out thecam-piece 39 may be moved longitudinally, and thus accurately adjustedto vary the point at which the gripper-fingers are caused to release theaper. The inclination of this dam-piece is in t e opposite directiontothat of the cam 15, and when the cylinder is moving in the directionfrom left to right in Fig. 1 the rounded end of the cam-shaft l2strikes-said inclined portion of the cam-piece, causing the shaft 12 tomove longitudinally, thereby raising the gripper and releasing theedgei-of the paper. he gripper can be removed without taking out anyscrews when it is desired to change the blanket. This removal canbeeffected by merely prying up and out over the studs 29 the ends of thesprings 27, when the gripper can be lifted out.

I claim- 1. In grippers for printin -pi'esses, the combinatlon of acylinder, a ongitudinallymovable central shaft therein havin camshapedannular depressions, a gripperhaving posts sliding through the wall ofthe cylinder, and means set in operation in the movement of the cylinderfor longitudinally moving said shaft to move said posts outward fromsaid depressions, substantially as described.

2. In grippers for printin presses, the combination of a cylinder, aTongitudinallymovable central shaft therein having camshaped portions, agripper having posts formed integral therewith engaged by said portions,and means actuated in the movement of the cylinder for longitudinallmoving sziitd shaft, subistantially as descril ied. h

p ers or rint' resses t e combinat i d n df a cylin der, if? p movablecentral shaft therein, a 'p ing Iposts integraltherewith and inovedradial y by said shaft, and means actuated in the movement of saidcylinder for so operating said shaft to move the posts radially,substantially as described.

' 4'. In grippers for combinatlon of a e per havlinder, aongitudinallymovable central s aft therein, a 'pperplate havinggripper-fingers formed mtegral therewith and moved radially by themovement of said shaft, and means actuated in the movement ofthecylinder for so operat ing said shaft to move the gri per-fingers ra-'ally, substantiall as descri ed 5. In grippers or printing-presses, thecombination of a cylinder having a-recessed portion, a gripper-platemovin against a wall of said recessed portion, and having rojections,and bow-springs secured to ear recessed portion and engagin projectionson the gripper-plate to press t e gripper-plate radially inward,substantially as described. 6. In grippers for prin ing-presses, the

ongitudinallyprintin -presses, the

combination of a cylinder having a recessed press the gripper-plateagainst said wall and portion, a gripperplate moving against a wall ofsaid recessed portion and having gripper-fingers and projections, postsformed integral therewith and sliding through a second wall of saidrecessed portion, and bow-springs secured to said latter Wall andengaging projections on the gripper plate to press the same radiallyinward, substantially as described.

7. In rippers for printing -presses, the combination of a cylinderhavinga recessed portion, a gripper -plate moving against a wall of saidrecessed portion and having gripper-fingers and projections, postsformed integral therewith and sliding through a second wall of saidrecessed portion, bow-springs secured to said latter wall and engagingprojections on the gripper-plate to press the same radially inward, andadjusting-screws for adjusting the tension of said bow springs,substantially as described.

8. In grippers for printing-presses, the combination of a spring, acyhnder having a recessed portion, a gri per-plate moving radiallyagainst one wal of said recessed ortion, and bow-springs having flexuresbot to also to press it normally inward or radially, substantially-asdescribed.

9. In grippers for printing-presses, the combination of a cylinder,slideways therefor, a gripper, a longitudinally-movable central shaftfor operating said gripper, a cam for operating said shaft, and a framefor supporting said cam secured dpartly to the frame of theprinting-press an partly to the slideway of the cylinder, substantiallyas described.

10. In grippers for printing-presses, the combination of a cylinder,slideways therefor, a gripper, a longitudinally-movable central shaft inthe cylinder, operating said gripper by its longitudinal movement, aframe secured partly to the frame of the press and partly to a slideway,a cam in said frame and means for adjusting said cam, substantially asdescribed.

In witness whereof I have hereunto set my hand in the presence of twosubscribing witnesses.

MORRISSON J. BARNETT.

Witnesses:

OSCAR THUNE-LARSEN, BESSIE GORFINKEL.

